MacBook Air Hands-on — Here's our take on the MacBook Air. It's super light, super fragile, and super small. If you just tap the screen lightly, the whole thing closes because it's so light. The keyboard looks a little weird because it's black on the aluminum, but the keyboard feels great.

Jobs Fails To Wow At Macworld — SAN FRANCISCO - — You could hear the collective sigh from the crowd. When Steve Jobs unveiled the newest member of the Macintosh fold, the skinny MacBook Air laptop, the Mac-faithful sighed with pleasure. But it was just a momentary exhale.

MacBook Air battery replacements: $129, free install! — We've got word back from Apple on MacBook Air battery replacement. The good news is a new MBA battery is the same as a new MacBook Pro battery: $129. And hey, installation is even free! The bad news hasn't changed though …

MacBook Air doesn't have a user-replaceable battery — We sort of understood it with iPods, and we grudgingly accepted it with the iPhone, but the MacBook Air has a sealed, non-user-replaceable battery, and that means we're suddenly a lot less in love. We're digging for details …

Live from Macworld 2008: Steve Jobs keynote — Thanks for joining us for our live Macworld 2008 keynote coverage! We're in, so click on, all our real-time updates are posted just after the break. — Note: this time we're updating from bottom to top, with the latest updates below.

Hey, Steve — you broke the Internet — Thanks for all the great toys, Uncle Steve, but did you have to go and break the Internet? I and about 7,000 other people were all signed up to get Twitter updates from MacRumors, but I never saw a single one — and in fact the entire Twitter.com network …

Twitter Fails Macworld Keynote Test — Many Twitter fans have become very much used to following big events via Twitter, its immediate nature and 140 character limit provides key points of what exactly is going on. — Unfortunately for Twitter users, Twitter completely failed during Steve …

Apple Reinvents Film Biz With iTunes Movie Rentals — Apple is about to turn the movie rentals business on its ear. — The new iTunes movie rentals service, announced Tuesday by Apple CEO Steve Jobs during his Macworld Expo keynote, is powered by deals with all the major film studios …

Breaking: Samwer Brothers Invest In Facebook — Serial German entrepreneurs Alexander, Marc and Oliver Samwer have invested in Facebook, we've heard from a very reliable source - presumably as part of Facebook's recent $15 billion valuation round with Microsoft. We are still trying to nail down the size of the investment.

700 MHz Auction Update — So 214 bidders have been approved for the forthcoming 700 MHz spectrum auction, which starts on Jan. 24. The big bidders include AT&T, Verizon and Google. These bidders will go after 1,200 licenses. — The bidding will conclude on March 24; down payments will be due by April 11.

Another Media Exec Leaves Yahoo — As Yahoo narrows its focus on a few key priorities, it's not surprising to see those whose projects fall outside those areas leave the company. And Yahoo's media group, whose once lofty mission to produce original, Hollywood-style content has been scaled …